These swallows were flitting about on some exposed branches, so I took some pictures. Looking at them, I'm wondering..... what's going on here? I mean, really, how many reasons are there for a bird to land on top of another bird....... My guess is - eggs! Everyone wants eggs! :-) But, it doesn't look like they are both the same kind of swallow. That bottom one doesn't look really very blue.
These pictures were taken all in a row, the camera takes about 5 frames per second.